PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

71781O-Ring

Eaton Corporation Dba Eaton Inoac Div Eaton · NSN 5331-01-205-9805 · FSC 5331 · O-Ring
Verified by PartsTable
NSN 5331-01-205-9805 — this item is cataloged by the U.S. Government under National Stock Number 5331-01-205-9805. Primary manufacturer part number: 71781.
Features
  • O-Ring — FSC 5331
  • 1 verified cross-reference
  • Primary manufacturer: Eaton Corporation Dba Eaton Inoac Div Eaton
Applications
  • Fluid containment and leak prevention
  • Pressure boundary maintenance
  • Environmental sealing
General Description

The O-Ring, cataloged under National Stock Number 5331-01-205-9805, is classified within Federal Supply Class 5331 (O-Ring) of the Hardware and Abrasives group. The primary manufacturer of record is Eaton Corporation Dba Eaton Inoac Div Eaton. This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameO-Ring
FSC / FSG5331 — O-Ring (FSG 53)
ManufacturersEaton Corporation Dba Eaton Inoac Div Eaton (CAGE 77842)
Technical Specifications
ParameterValue
NSN5331-01-205-9805
Primary Part Number71781
Item NameO-Ring
FSC / FSG5331 / 53 — O-Ring
ManufacturerEaton Corporation Dba Eaton Inoac Div Eaton
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 2
3110-00-175-2549 INTERCHANGEABLE
Bearing,ball,duplex
5340-00-795-548971781 INTERCHANGEABLE
Seat,helical Compression Spring
Triumph Engine Control Systems Llc
Cross-Reference Index
Part NumberManufacturer
71781 PRIMARY Eaton Corporation Dba Eaton Inoac Div Eaton (USA)
Related Parts
3110-00-175-2549INTERCHANGEABLE
BEARING,BALL,DUPLEX
5340-00-795-5489INTERCHANGEABLE
SEAT,HELICAL COMPRESSION SPRING
71781

Frequently Asked Questions

What is NSN 5331-01-205-9805?

NSN 5331-01-205-9805 is a O-Ring, manufactured by Eaton Corporation Dba Eaton Inoac Div Eaton, classified under FSC 5331 (O-Ring). Status: active.

What are the part numbers for NSN 5331-01-205-9805?

NSN 5331-01-205-9805 has 1 cross-referenced part number: 71781 (Eaton Corporation Dba Eaton Inoac Div Eaton).

What NSN replaces 5331-01-205-9805?

There are 2 known substitutes for 5331-01-205-9805: 3110-00-175-2549, 5340-00-795-5489. Verify interchangeability with system specifications before substitution.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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